package com.caibq.test;

import java.util.HashMap;

/**
 * projectName: demoBox
 *
 * @author: caicai
 * time: 2024/6/20 17:35 周四
 * description:
 */
public class Ab0620 {

    public static void main(String[] args) {
        HashMap<String, Object> map = new HashMap<>();
        map.put("a",null);

        Object a = map.get("a");

        String s = String.valueOf(map.get("a"));


    }

}
